The colour you use adds not only emotion but points to other basic areas of meaning. It is part of the message. It has its own psychology.
There is a real difference in the effects that, for example, a bright, full, basic colour will have upon someone looking at your content in comparison with that provoked by a softer, gentler, perhaps pastel shade will generate. There is a difference between the strident, blaring simplicity of one and the more subdued suggestions of the other. This can and should be echoed in the accompanying text. Are you shouting a statement or telling a story perhaps with a little decoration? Are you making a plain statement or suggesting a scene, a background, gesturing towards a series of feelings.
Source: Color Theory 101: The Basics
Similarly your choice of illustration – accompanied by its own palette and the emotions it brings along – makes a statement, it aids in telling the story, it also suggests what all of your content should be bringing to the table. You are looking to have particular groups, segments of the viewing public relate to your content in an effectively positive way. One should reinforce the other and so on – colour, image, text, channel, timing.
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